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- Q133 - Deck Safety: Stability Problems
206. Your vessel's drafts are: FWD 22'-04″, AFT 22'-10″; and the KG is 18.4 feet. Use the selected stability curves in the blue pages of the Stability Data Reference Book to determine the righting arm at 30° inclination.
The righting arm at 30 inclination is determined by finding the appropriate stability curve based on the mean draft, reading the KN value at 30, and calculating GZ using the formula GZ = KN — KG sin θ. With a mean draft of approximately 22'-07″, a KG of 18.4 feet, and a KN value of 4.6 feet derived from the stability curves, the righting arm is 4.6 feet.
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